CAJ | 학술논문

采用下垂控制策略的分布式电源逆变器在电压调整、环流抑制、应对非线性负载影响和提高功率分配精度方面仍有较大改善空间。针对逆变器并联环流和功率分配精度不高问题，提出通过设计虚拟阻抗减小并联运行逆变器间的输出阻抗差异，降低环流及改善功率分配精度的同时引入电压闭环反馈，避免了较大的虚拟阻抗引入带来的电压降落弊端。分频下垂控制逆变器设计具备了应对特定次谐波负载的能力，同时提出了一种并联逆变器按照额定容量分配功率的实现方案。仿真结果表明，改进分频下垂控制逆变器将有效改善微网内部电压调整、降低谐波和提高功率分配精度。实验证明，分频谐波下垂控制器对非线性负载环境下降低特定次谐波含量有积极作用。
채용하수공제책략적분포식전원역변기재전압조정、배류억제、응대비선성부재영향화제고공솔분배정도방면잉유교대개선공간。침대역변기병련배류화공솔분배정도불고문제，제출통과설계허의조항감소병련운행역변기간적수출조항차이，강저배류급개선공솔분배정도적동시인입전압폐배반궤，피면료교대적허의조항인입대래적전압강락폐단。분빈하수공제역변기설계구비료응대특정차해파부재적능력，동시제출료일충병련역변기안조액정용량분배공솔적실현방안。방진결과표명，개진분빈하수공제역변기장유효개선미망내부전압조정、강저해파화제고공솔분배정도。실험증명，분빈해파하수공제기대비선성부재배경하강저특정차해파함량유적겁작용。
There is still room for improving the DG droop controller in terms of voltage adjustment, circulation inhibition, nonlinear load solution and power distribution accuracy by using the droop control strategy. On the issues that parallel circulation and power allocation accuracy of the inverter is low, the equivalent output impedance was redesigned to reduce differences of impedances between parallel operation inverters, bring down parallel circulation and improve the accuracy of power allocation. The public connection point voltage feedback loop was introduced to avoid the voltage drop. The design of frequency dividing droop control can cope with specific harmonics well. Simulations prove that the robust frequency dividing droop controller can improve the voltage regulation, reduce the harmonic and increase the accuracy of power allocation. Experiments show that the controller can effectively reduce the harmonic content in the contact line.